# Photons Energy Level

#### Air

I understand that electrons are excited to higher energy levels. When they fall back levels, photons are emitted.

If green light has wavelength $5.58 \times 10^{-7}m$ and red light has wavelength of $6.48 \times 10^{-7}m$, why is it that when a photon is emitted from green light, it falls a greater energy level?

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#### Mapes

Homework Helper
Gold Member
What is the relationship between energy and wavelength for electromagnetic waves?

#### Air

$v = f \lambda$
$E = hf = \frac{hv}{\lambda}$

So green light has a smaller wavelength hence a larger value of energy. Is this why it falls a greater energy level?

Homework Helper
Yes, that is so.

#### atom888

$v = f \lambda$
$E = hf = \frac{hv}{\lambda}$

So green light has a smaller wavelength hence a larger value of energy. Is this why it falls a greater energy level?
so... if E=hf, green light have more energy than red light?

#### Defennder

Homework Helper
Yes, but that energy is per photon.

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